I'm a bit unsure on how to tackle this question. Never seen one like it before. Can anyone give me a few hints/point me in the right direction
Cheers

 

First, read how to post questions in the Homework Help section... Click on the link.

 

Um...
What the formula to find f1?

 

Break it into two circuits at Node V1. Do the first part of the problem (getting the frequency you want). What will the waveform at V1 look like?

Then apply that waveform to the second part of the circuit (the integrator).

Above all -- show YOUR best effort to answer YOUR homework as far as you can.

 

Um...
What the formula to find f1?

f1 = 82Hz

 

f1 = 82Hz

Ok, you know all the values of all the resistors, you know f1. Now solve for C1.